Boosting a signal-to-interference ratio of a mobile station

• US 20060003794A1
• Filed: 09/08/2005
• Published: 01/05/2006
• Est. Priority Date: 10/12/2001
• Status: Active Grant

• Current Assignee: Ericsson Evdo, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Incorporated (CommScope Holding Company, Inc.)
• Inventors: Chung, Sae-Young, Eyuboglu, M. Vedat, Kim, Dae-Young, Harikumar, Gopal
• Granted Patent: US 7,242,958 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile

Abstract

In a cell of a cellular wireless communication system, the SIR of at least one user in a sector of the cell is altered by temporarily reducing transmissions on a forward link in at least one other sector of the cell or a sector in another cell in accordance with a pattern.

Claims

1-19. -19. (canceled)

20. A method for transmitting encoded data packets to one or more mobile stations in a communication system including a cell that has sectors serving at least partially different geographic areas, the method comprising:

transmitting in a first sector an encoded data packet in one or more time slots to a mobile station;

reducing transmission power in a second sector during one or more of the time slots in which the first sector transmits the data packet to the mobile station;

decoding at the mobile station the encoded data packet after each time slot;

transmitting by the mobile station a signal indicating acknowledgment of the packet reception when the decoding of the packet is successful; and

in response to receiving the acknowledgement signal, ceasing transmission of the data packet in the first sector in subsequent time slots.

21. The method of claim 20 wherein transmitting the data packet in the first sector while reducing transmission power in the second sector is controlled according to a pattern.

22. The method of claim 21 wherein the pattern is organized in a sequence of time slots and the pattern defines which sectors transmit data packets and which sectors reduce transmission power in each of the time slots.

23. The method of claim 21 wherein the pattern is a predetermined pattern repeated over time.

24. The method of claim 21 further comprising:

determining a current state of transmissions in each of the sectors; and

determining the pattern based on the determined current state of transmissions.

25. The method of claim 24 wherein the state of transmissions includes information about a scheduling status of transmissions in neighboring sectors.

26. The method of claim 25 wherein the state of transmissions includes information about current transmission rates of a sector.

27. The method of claim 24 wherein the state of transmissions includes information about a next time slot scheduled for transmission in a sector.

28. The method of claim 24 wherein the state of transmissions includes information about a forward link signal-to-interference ratio measured at a mobile station located within a sector.

29. The method of claim 24 wherein the state of transmissions includes information about an estimated location of a user scheduled to receive a data packet in a sector

30. The method of claim 24 wherein the state of transmissions includes a fairness parameter for a user scheduled to receive a data packet in a sector.

31. The method of claim 24 wherein the state of transmissions includes information about an application type of a user scheduled to receive data packets in a sector.

32. The method of claim 24 wherein the state of transmissions includes information about a quality of service level of a user scheduled to receive data packets in a sector.

33. The method of claim 20 further comprising:

arranging a frequency reuse factor of one or higher in the communication system.

34. The method of claim 20 wherein the second sector does not transmit any data packets while its transmission power is reduced.

35. The method of claim 20 wherein the second sector transmits data packets at a reduced transmission rate while its transmission power is reduced.

38. The method of claim 20 wherein reducing transmission in a sector comprising suppressing transmission in the sector.

36-37. -37. (canceled)